‘Stand still like the hummingbird’ at David Zwirner is a group show as full of contradictions as it sounds, from Rodney Graham’s upside down oak tree photos to Robert Gober’s bronze slab painted to look exactly like a block of dirty Styrofoam. Musician and comedy writer Mason William’s 1967 life-size silkscreen of a Greyhound bus is a standout for its size alone, but the warning on the side of its box (displayed on a pedestal in front of the print) to avoid opening the artwork in the wind creates an amusing mental image with even more impact. (Through August 3rd).